Diphosphatidylglycerol OH 0 CH2-C-CH2 CH2-O-C-R1 O H CH2-O-C-R3 R2-C-O-CH O-POH O=POH R4-C-O-CH CH2 0 CH2Diphosphatidylglycerol C O CH O R 2 CH 2 CH 2 O C O R 1 O P O O OH CH 2 C OH H CH 2 O PO O OH CH 2 OC CH O R 4 CH 2 O C O R 3